Radio appabatxts



Oct. 30, 1928.

A. F; SANFORD RADIO APPARATUS Filed Aug. 18, 1925 5 Sheets-Sheet 1 Oct. .30, 1928. 1,689,603

A. F. SANFORD -RADIO APPARATUS Filed Aug; 18, 1925 s Sheets-Sheet 2 Oct. 30, 1928. 1,689,603

. A. F. SANFORD RADIO APPARATUS Filed Aug. 18, 1925 5 Sheets-Sheet 3 Oct. 30, 928. 1,689,603

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A. F. SAN-FORD RADIO APPARATUS Filed Aug. 18, 1925 5 Sheets-Sheet 5 Patented Oct. 30, 1928.

ALFRED F. SANFORD, OF KNOXVILLE, TENNESSEE.

RADIO APPARATUS.

Application filed August 18, 1925. Serial No. 51,066.

This appa 'atus relates particularly to means for bringing; a radio-receiving appa 'atus into tune with the apparatus at different sending stations.

An object of this invention is to associate with the tuning members of a radio-receiving apparatus means for moving thetuning members into positions whereby they are brought into tune with the sending apparatus of chosen sending stations, the receiving apparatus including movable means bearing a record-receiving surface and movable in fixed relation with one of the tuning members, said record-receiving surface being in tended to receive records indicating the positions of that tuning shaft and one or more other tuning shafts when both or all the shafts are in tune with a chosen sending station.

A further object of this invention is to provide mechanism whereby records may be madeon the record-receiving surface in a form to facilitate placing two of the tuning shafts into harmonywith the other tuning shaft when that shaft is turned into a chosen position, this being for the purpose of progressively turning the three shafts in harmony with each other through the meter range of that instrument for the purpose of finding any SGIlCllTlP station then operating within the range of the receiving set.

In the form shown by the drawings, there are three tuning shafts and the member hearing the record-receiving surface is in the form of a disc which is geared to one of the tuning shafts to cause simultaneous rotation of the disc and said shaft, the disc being 011 a shaft which bears. a hand knob to be engaged for turning the disc. With each of the other tuning shafts there is associated a bar which extends horizontally across the face of the disc and is geared to one of the other tuning shafts in a mannerto cause .endwise movement of the bar when said tuning shaft is turned Those bars are used as guides or indicators for making records of the positions of the tuning shafts, as will hereinafter appear. i

In the accompanying drawings, Fig. 1 isa front elevation of a radio receivin; apparatus embodying my improvement; Fig. 2 :shows the front supplemental wall removed and the shafts extendinginto that wall sectioned; i

Fig. 3 is an upright section on the line, 33, of Figs. 1 and 2, looking toward the right;

1g. 4 is a horizontal section on the line 47-4 of Figs, 1 and 2;

Fig. 5 is a horizontal section on the line, 55, of Fig. 4:,

:Fig. 6 is a detail sectional elevation of the rack bars and parts associated therewith;

Fig. 7 is an upright section on the line,

7--7, of Figs. 2 and 3, looking toward the right;

Fig. 8 is an upright section on the line, 88 of Figs. 2 and 6, looking toward the right;

Fig. 9 is an upright section on the line, 99, of Fig. 6, looking toward the right;

Fig. 10 is an upright section on the line, 10-10, of Fig. 6, looking toward the right;

Fig. 11 is a front elevation of the record receiving disc and the members forming a guFde for making records when the tuning shafts have been turned into tuned position, the disc showing a succession of such records connected by spiral lines.

Referring to the drawings, A is the main front wall of a radio receiving apparatus embodying my improvement; A is the right hand end wall; A is the left hand end wall; A is the base; A is the supplemental front wall rising from the base approximately half way to the top wall, A", and spaced a short distance from the main wall, A, as seen in Fig. 41-.

Three tuning shafts, B, C and D (for con vcnience designated, first, second, and third, respectively), are supported on .the main wall, A, in the same horizontal plane. The tuning shaft, B, rests in a bearing, B seated in the wall, A. The shaft, B, projects only a short distance forward through said bearing. A. retaining collar, B, surrounds and is fixed to said shaft close to the forward end of said bearing. At the inner end of said bearing the shaft, B, is surrounded by a spur gear wheel, and secured to the shaft by a set screw, B The spur gear wheel, B meshes with a smaller spur gear wheel, E, which surrounds and is fixed on the transmission shaft, E which shaft rests inbearings, E supported by the walls, A and A,

above the tuning shaft, B. The shaft, E

extends forward from the wall, A. Near the wall, A,.a record-receiving disc, E surin the path of the pins, C

rounds and is fixed to the shaft, E for rotation with tltt shaft. On the outer end of the shaft, E is a hand knob, E which may be grasped by the hand of the operator for turning the shaft, E Turning that shaft causes the turning of the disc, E and the spur gear wheel, 1*], and the spur gear wheel, ll, and the tuning shaft, B.

The tuning shaft, C, extends through the walls, A and A and rests rotatably in the bearing, C seated in the wall, A, and in the bearing, C seated in the wall, A On the outer or forward end of the shaft, C, is a hand knob, C, which is to be grasped by the hand of the operator for turning said shaft. Close to the inner end of the bearing, C a collar, C surrounds and is fixed to the'shaft, C. Said collar serves to limit forward move ment of the shaft. On said collar are two radial diametrically opposite pins or arms,

ing shaft, B, depends upon rotation of the transmission shaft, E

The tuning shaft, D, alsoextends through both walls, A. and A, and rests rotatably 1n the bearing, D seated In the wall, A, and in the bearing, D seatedin the wall, A; A

hand knob, D is fixed on the outer or forward end of the shaft, D. That knob is to be grasped by the hand of the operator for turning said shaft. Close to the inner end oft-he bearing, D a collar, D similar to the collar, C on the shaft, C, surrounds and is fixed to the shaft, D. On said collar are two radial diametrically opposite pins or arms, I). A stud, D, is fixed. on the bearing,-D in the path of the pins or arms, D

Thus the shaft, D, is limited to a one-half rotation as already described regarding the tuning shaft, C.

The front of the disc, E is to be a surface adapted to receive records of sending stations with which the receiving apparatus has been brought. into tune. -Associated with each of the tuning shafts, C and D, is a re ciprocatory bar; 'Those bars are horizontal V and near each other and near the front face of the disc. Those barsf are used as guides or indicators for placing on the disc a sending station record.

F is the bar' associated with. the tuning shaft, C, and G is the bar associated with the tuning shaft, D. These bars are supported in a stationary channel bar, H, which is supported 'onbra-ckets, H seated on the front face of the main wall, A, near the edge of the disc, E the brackets extending forward a distance suited to bring the channel bar close to the front face of the disc. Each bracket has an upper and a lower horizontal arm, H those arms being spaced from each other to bear against the upper and lower faces of the channel bar, H. Screws, H, extend through said arms into the flanges of the channel bar for immovably securing said bar to the brackets. The open part of the bar, H, is directed toward the wall, A. Thus the web and flanges of the channel bar, ll, and the faces, H of the brackets form guide ways for the bars, F and G, the bar, F, lying against the lower flange of the bar, H, and the bar, G, resting against the upper flange of the bar, IT. The shaft, E, passes between the bars, G and F, and serves to confine those bars close to the adjacent flanges of the channel bar, H. 011 the right hand bracket, H astud, H in a similar manner extends between the bars, F and. {in On the left hand bracket, H, a stud, ll, is given a similar position to aid in. guiding the endwisc IDOVQHlOIliZH of the bar, G.

The bar, F, is a rack bar having its teeth turned downward and engaging a spur gear wheel, C, which is rotatable on a. shaft, C, supported on the *alls, A and A. The lower flange of the channel bar, H, is cut away to make room for the upper part of the spur gear wheel, C. That wheel meshes with the spur gear wheel, C, which is rotatable with the shaft, C", which rests in bearings, C in the walls, A and A. The wheel, C meshes with the larger spur gear wheel, C which surrounds and is fixed to the tuning shaft, C, near the bearing, C. Thus said wheel holds the tuning shaft against rearward movement.

It will now be seen that when the tuning shaft, C, is turned by turning the hand knob, C the spur gear wheel, C will correspomlingly turn and that will cause the turning of the spur gear wheels, C and C, and the latter will cause the endwise movement of the rack bar, F, the direction of the movement of that bar depending upon the direction of turning of the tuning shaft,

The rack bar, G, is a rack bar having its teeth turned down ard and engaging a. spur gear wheel, I), which is rotatable on a shaft, 1), supported on the walls, A and A. The lower flange of the channel bar, H, is cut away to make room. for the upper part of the wheel, I). The wheel, I)", meshes with the spur gear wheel, I), which is rotatable with the shaft, D which rests in bearings, D in the walls, A and A The wheel, D, meshes with the larger spur gear wheel, D which surrounds and is fixed to the tuning shaft, D, near the bearing, D Thus said wheel holds the tuning shaft against rearward movement.

It will nowbe seen that when the tuning shaft, D, is turned by turning the hand knob, D the .spurgear; wheel, D will correspondingly turn and that will cause the turning of the spur gear'wheels, D and D and the latter will cause the endwise movement of the rack bar, G, the direction of the movement of that bardepending upon the direction. of turningof the tuning shaft, -w

. At the right of the shaft, E and in front 7 of 1 the disc, E the web of the channel bar H, is. cut away to expose the rack bars, Fand G. The bar, G, is extended toward the. right into the right hand end of the. channel bar in order that the bar, G, may appear in the open part of the channel bar, That part of the bar, G, has itslower face beveled and not provided with gear teeth. Said face is provided with a downward-directed tooth or pointer, G The rack bar,.F, need be extended leftward only far enough to keep it in said opening during; reciprocations. On the part of the bar, F, remainingin said opening during reciprocations is an upward-directed. tooth or pointer, F similar to the tooth or pointer, G

It willnow be seen that during the turning of the tuning shaft, C, the bar, F, and the tooth or pointer, F will be carried horizontally. It will likewise be seen that during rotation ofthe tuning shaft, D, the bar, G, and the tooth or pointer, G will be carried horizontally. Thus when the shafts, C and D, have been turned to bring them into tune with the chosen sending station, the teeth or pointers, F and G will be in positions related to. the positions of the. shafts, CandD..

As already-stated, the tuning; shaft, 13, and. the disc,.E turn in relation to each other-when the shaft, E is turned. Thus turning the tuning shaft, B, to bring it into tune, with the chosen sending station will bring a certain part of theouter surface of the disc immediately behind the space between the bars. F and G, at the right of the shaft, E Now a record ismade on the disc by drawing;- a pencil or other writing instrument in said space along the lower edgeof thebar, G, and againstthe disc, and along, the upper edge of the-.bar, F, and against the disc. On passing, the toot-h or pointer, G the line drawn by thefpencil will be given a deviation in theform of a down- .ward. fold, and on passing the tooth or pointer, F the line drawn by the i pencil will be given a similar deviation inthe form of an upward fold. Then any desired. symbols identifying thesending station are to be written between, the two lfiorizontal pencil. lines. For this the initials and. the name and the wave length of the sending station may beused,according to thedcsire of the operator i When this receiving apparatus is to be brought into tune with another sending station, the hand knobs, E C, and D are turned until the tuning shafts, B, C, and D, are in tune with that sending station. Then a record of that station is made between the rack bars, F and G, in the manner already described.

lVhen it is desired to bring this apparatus again into tune with the first sending station, it is only necessary to turn the disc, E",

to again bring the record of that station into the space between the rack bars, and then turn the knob, D until the tooth, G of the bar, G, registers with the fold. in the upper line, and then turn the knob, C, an til. the tooth, F of the" bar, F, registers with the fold in the lower line of the record. Thus the three tuning shafts and thetuningmechanism connected therewith are positioned as they were when the record was made. i

The spur gear wheel, B larger than the spur gear wheel, E, the ratio being two to one, in order that the disc, E, may make a full rotation while the tuning shaft, B,

given a one-half rotation. Thus the entire surface of the record-receiving disc, E ismade available for receiving records of stations brought into tune during the half rotation of the tuning shaft, B.

For positioning the record on the disc, the two rack bars serve guide members. For making thespecifie part of the record relating to the tuning shaft, D, the tooth, G is the. guide, while the specific part of the record relating to the tuning shaft, C, the tooth, F is the guide.

It will be understood that if the receiving apparatus contains only two tuningshafts, one of the rack bars may be oniiitted.

. It will. be understood that records may be placed directly on the surfaceof the disc, E or on paper or similar sheet-form material placed on the front face of the disc.

. The parts may be so proportiomid as to allow eliminating the wheels v DZ'D, (i and C and bringing; the wheels, D and C into engagement with the bars, G and F, respectively.

It has been found in practice that the records made by the teeth, F and G range themselves inspiral lineson the disc, E as illustrated byFig;- 11. This drawing showsv the teeth or pointers, F and G, separated. the greatest distance for Newark. For making the record for Philadelphia, these teeth were brought-nearer to. each other. For New York they were brought still nearer,andstill nearer for Boston, and still nearerfor Pittsburgh. For Davenport, the teethor. pointers passed. eachfother a short distance. For Miami, they moved from eachother stilt further. Aline. I, drawn through and-on the course of. therecords loo these lines will cross in this manner de pends upon the direction of action of the gearing on the bars, F and G.

At the time eac'lrrecord was made, the three tuning shafts were placed in tune or in harmony with each other as well as with the sending station indicated by that rec- 0rd. To feel 01" seek for an unknown station in a space between any two records,'the disc is to be turned until a part of said space is in the recording space between the bars, F and G. The bar, F, is moved to bring the tooth, F into the spiral line, J, and the bar, G, is moved to bring the tooth, G into the spiral line, I. This brings the three tuning shafts of the receiving apparatus into tune or harmony with each other, and if it so happens that that position of the shafts brings any one of the three shafts i'nto tune with a sendinglstation, the three shafts are in i31l1'16\Vltll that sending station.

In this manner, the disc may be slowly turned through its entire range to feel for or seek sending stations operating at that time and of which the operator of the receiving set does not have the namesv'nor wave length numbers. If at such time the name of that sending station is learned by the operator of the receiving set, a record inclu'dingthe name of that sending station and a marking of the teeth, F and G is made. Thereafter the receiving set may be 'put into tune with that sending station in the usual manner, namely by turning the disc until the record is in the space between the bars, F and G, and then moving the teeth or pointers, F and G into the records of those teeth or pointers.

Thus it will be seen that the records made by the aid of any tooth or pointer constitute a graduated series, there being a lateral gradation of said records on the record receiving surface and there being also a gradation as to wave lengths, the wave lengths increasing or decreasing through the series of said records, depending upon the direction taken on the series. It is also seen that any two such records between which there is no record are related to each other and between them are positions for recording I the records made by one tooth or pointer will form such a graduated series, and the records made by the aid of the other tooth or pointer will form a similar graduated series,-and the records made by the aid of one tooth or pointer will stand paired on the record surface with the records made by the aid of the other tooth or pointer.

' It is also to be noted that either tooth or pointer together with any part supporting said tooth or pointer is in the nature of a guide for marking a record after the associated tuning shaft has been turned into the desired position. And afterward said meu1- ber serves as a guide for returning the record-receiving (now the record-bearing) surface into the position which it occupied when the record was made.

I claim as my invention:

1. In an apparatus of the kind described, the combination of three independently turnable tuning shafts, a movable rccord= receiving member in operative relation with one of said shafts for movement therewith, two guide members movable independently of each other and supported near each other and in front of the face of the record-receiving member for movement transversely to the course of the record-receiving member and each bearing position indication. one of said guide members being in operative relation with the second of said shafts for 1110 vement simultaneously with the turning of said shaft, and the other guide member being in operative relation with the third tuning shaft for inoven'ient simultaneously with the turning of said shaft,

2. In an apparatus of the kind described, "the combination of three independently turnable tuning shafts, a disc-form rotatable record receivingmember in operative relation with one of said shafts for movcnient therewith, two guide members movable independently of each other and supported near each other and in front of the face of the recorddeceiving member for movement transversely to the course of the recordreceiving member and each bearing position indication, one of said guide members being in operative relation with the second of said shafts for movement simultaneously with the turning of said shaft, and the other guide member being in operative relation with the third tuning shaft for movement simulume ously with the turning of said shaft.

3. In an appartus of the kind described, the combination of two independently turnable tuning shafts, a disc-form rotatable record-receiving member in operative relation with one of said tuning shafts for rotation on an aXis parallel to said tuning shaft, the other tuning shaft being parallel to the vfirst tuning shaft, a guide member supported near and in front of and movable transversely to the course of the record-receivi11g member and bearing position indication, and gearing intervening said guide member and said other tuning shaft.

4. In an apparatus of the kind described, three independently turnable tuning shafts :ihseeot parallel to each other and turnable independently of each other, a fourth shaft par allel to said tuning shafts and in operative relation with the first of said tuning shafts for-turning .s' uultaneously with said tuning a recoi l-receivingmember in operative iclation with said to rtrshaft to receive motion simultaneously wi 1 said shaft, two guide members supported near each other a ul in front of the fare of the record-receiving nu-unber for movement transversely to the course of movement of the recoi'dre'ceiving; member and each bearing position indication, one of said ,Q'UlCle members being in o 'ierative relation with the second tuning; shaft formovement therewith and the other guide member being in operative relation with the third tuning shaft for movement therewith.

5 In an apparatus of the kind described, three tuning shafts parallel to each other and turnab'le independently of each other, a fourth shaft parallel to said tuning shafts and in operative relation with the first of said tuning shafts for turn ng slmultaneously with said tuning shaft, a record-receivingimember ;in operative relation with said fourth shaft to 1'eceiven1oti m simultaneously with said shaft, two endwise reciprocable guide members supported and movable independently of each other for movement transversely to the ,course of move ment of the reeord-receiving member and eachbearing position indication, one of said guide membersbbeing in operative relation withthe second tuning; shaft and the other guide member being in operative relation with thethird tuning shaft for movement therewith.

-6. In an apparatus of the kind described, the combination of two tuning shafts turnable independentlyof each other, a trans missionshaft, gearing connecting said shaft @and the first tuning shaft for simultaneous movement, the trans-mission shaft making approximately ,a full rotation while said tuning shaft makes a one-half rotation, a record receiving member connected 'with the transmission shaft for movement with said shaft, a second tuning shaft, a guide memljier in front ofjthe face of and movable transversely to the course of movement of the reeord-receiving member and bearing position indication, and means placing the second tuning shaft and said guide member into operative relation for simultaneous movement.

7. In an apparatus of the kind described,

the combination of two tuning shafts turn able independently of each other, a transmission shaft, gearing; connecting said shaft and the first tuning shaft for simultaneous movement, the transmission shaft making" approximately a full rotation While saidtuning shaftmakes a one-half rotation, a disc front of the face of and movable trans versely to the course of movement of the record-receiring member and bearing position. indication, and n'ieans placing the sec ond tuning shaft and said guide member into operative relation for simultaneous movement. v

8. In an apparatus of the kind described, the combination of two tuning shafts turnable indepemleutly of each other, a rotary disc-form record-receiving member in operative relation with one of said tuning shafts, and a reeiprocatory bar extending across the face of said discform member transversely to the course of movement of the discform member and bearing position indication, and means placing said. bar into operative relation with the other tuning shaft for reciprocation of said bar during the movement of said shaft. 7

9. In an apparatus of the kind described, the combination of a movable record-receiw ling member, a tuning shaft turnable simultaneously with the movement of the recordmeans placing said guide member into open ative relation with said tuning shaft for movement simultaneously with the turning of said shaft.

10. In an apparatus of the kind described,

the combination of two tuning shafts turnable independently of each other, a movable record-receiving member in operative relation with one of said shafts, a movable guide member near and parallel .to the face of the record-receiving member and having an edge for guiding a writing instrument, said edge having a deviation for changing the course of the writing instrument, and means placing said guide member into operative relation with the other tuning shaft for movement of said guide member simultaneously with the turning of said shaft and trans? versly to the movement of the record-receiv- Zing member.

ll ln an apparatus of the kind described, the combination of three tuning shafts turna ble independently of each other,

movable record-receiving member inoperative relation with the first of said shafts, a

movable guide member near and parallel to the face of the record-receiving member and having an edge for guiding a writing instrument, said edge having a deviation for changing the course of the Writing instrutransversely to the ment, means placing said guide member into operative relation with the second tuning shaft for movement of said guide member s1- multaneously with the turning of said shaft, a second movable guide member near and parallel to the first guide member and having an edge for guiding a writing instrument, said edge having a deviation for changing the course of the writing instru;

ment, and means placing said second guide member into operative relation with the third tuning shaft for movement of said guide member simultaneously with the turning of said shaft.

12.. In an apparatus of the kind described, the combination with two tuning shafts turnable independently of each other, of a record-receiving member in operative relation with one of said shafts for moving simultaneously with the turning of said shaft, a supporting bar extending across the face of said record-receiving member direction of movement of the record-receiving member, and

indicating means movable on and'parallel to said supporting bar and in operative relation with the other tuning shaft for movlng said indicating means simultaneously with said shaft.

13. In an apparatus of the kind described, the combination with two tuning shafts turnable independently of each other, of a record-receiving member in operative relation with one of said shafts for moving simultaneously with said shaft, a supportmg bar extending across said record-receiving member transversely to the direction of movement of the record-receiving member, and indicating means slidable lengthwise on said supporting bar and in operative relation with the other tuning shaft for sliding simultaneously with. the turning of said shaft;

14:. In an appartus of'the kinddescribed,

the combination with three tuningshafts turnable independently of each other, of a record-receiving member movable with the first tuning shaft, a supporting bar parallel to and extending across the face of said record-receiving member transversely to the direction of movement of the record-receiving member, two guiding members supported on and slidable along the length of said supporting bar and each bearing position indication, means placing one of said guiding members into operative relation with the second tuning shaft for simultaneous movement with said shaft, and means placing the other guiding member into operative relation with the third tuning shaft for simultaneous movement with said shaft.

15. In an apparatus of the kind described, the combination with three tuning shafts 'turnable independently of each other, of a record-receivingmember movable with the first tuning shaft. a supporting bar parallel to and extending across the face of said record-receiving member transversely to the direction of movement of the record-receiving member, two endwise reciprocable guiding members supported on said supporting bar and each bearing position indication, means placing one of said guiding members into operative relation with the second tuning shaft for simultaneous DlOVGIHQDt with said shaft, and means placing the other guiding member into operative relation with the third tuning shaft for simultaneous movement of said two members.

16. In an apparatus of the kind described, the combination of two indcpeiulently turnable tuning shafts, a member in operative relation with one of the tuning shafts for movement therewith and bearing a record-receiving surface on which are records relating to the tuning shafts and on which is marking extending diagonally to the course of movement of the record-receiving surface and indicating the position to be given to the below-mentioned movable guide when a chosen part of said surface has been moved to said guide, and a movable guide in operative relation with the other tuning shaft for movement therewith transversely to the course of movement of said record-receiving surface and bearing position indication.

17. In an apparatus of the kind described, the combination of three independently turnable tuning shafts, a member in operative relation with one of said shafts for movement therewith and bearing a recordreceiving surface on which are records rclating to the three tuning shafts and which records are on two courses extending diagonally to the course of movement of said record-receiving surface and indicating the positions to be given to the below-mentioned movable guides when a chosen part of said surface has been moved to said movable guides, and two movable guides on a line transverse to the course of movement of said record-receiving surface and each bearing positionindication, one of said guides being in operative relation with the second of the tuning shafts for movement therewith and the other of said guides being in operative relation with the third tuning shaft for movement therewith.

18. In an apparatus of the kind described, the combination with two independently turnable tuning shafts, of guiding means ineluding a member movable transversely to the course of movement of the below-mew tioned record-receiving surface and in operative relation with one of said tuning shafts for movement therewith, and a movable record-receiving member in operative relation with the other of said tuning shafts for movement therewith and having :1 recold-receiving surface on which are records including markings indicating positions for said movable guide members, said markings being on a course inclined to the course of movement of said record-receiving surface, and said surface having an inclined line on tending along the course of said markings;

19. In an apparatus of the kind described, the combination with two independently turnable tuning shafts, of guiding means including a member movable transversely to the course of movement of the belowmentioned recorda'eceivingi surface and. in operative relation with one of said tuning shafts for movement therewith, and a discforin rotatable record-receiving member in operative relation with the other of said tuning shafts for movement therewith and having a recordereceiving surface on which are records including markings indicating positions for said movable guide n'iember, said markings being on a spiral. course.

20. In an apparatus of the kind described, the combination with two independently turnable tuning shafts, of guiding means including a member movabletransversely to thecourse of movement of the belrowanentionedrecord-receiving surface and in operative relation with one of said tuning shafts for movement therewith, and a discform, rotatable record-receiving member in operative relation. with the other of said tuning shafts for movement therewith and having a record-receiving surface on which are records includingmarkings indicating positions for said movable guide member, said markings being on a spiral course, and said surface, having a spiral line extending along said course. i

21. In an apparatus of the kind described, the combination of three independently turnable tuningshafts, of guiding means includ ing two members independently movable transversely to the course of the belowmentioned record-receiving surface, one of said guiding members being in operative relation with one of said tuning shafts for movement therewith and the other of said guiding members being in operative relation with the second of said shafts for movement therewith, and a movable record-receiving member in operative relation with the third of said tuning shafts and having a recordreceiving surface 011 which are records ex tending on two courses diagonally to the course of the recordreceiving surface and which records include markings indicating positions for said movable guide members, said markings being on two courses inclined to the course of movement of said surface.

22. In an apparatus of the kind described, the combination of three independently turnable tuning shafts, of guiding means including two members independently movable transversely to the course of the belowmentioned record-receiving surface, one of said guidii'lg members being in operative, relation with one of said tuning shafts for movement therewith and the other of said guiding members being in operative relation with the second of said shafts for movement therewith, and a movable recordreceiving member in operative relation with the third of saidtuningshafts and having a recordreceiving surface onwhich are records cx tending on two courses diagonallyto the course of the record receiving surface and which records include markings indicating positions for said movable guide members,,} said markings being on two courses inclined to the course of movement of said surface and said surface having lines along the course of said markings.

23. In an apparatus of the kind described, the combination of two tuning shafts turnable independently of each other, a movable I member bearing a record-receiving surface,

two guides movable independently of each other along the face of and transversely to the course of movement of the record-receiv ing' surface and each bearing position indication, means connecting one of the guides with one of said tuning shafts for movement with said shaft, and means connecting, the other of the guides with the other of said two tuning shafts for movement with said shaft. v

24. In an apparatus of the kind described, the combination of two tuning shafts turnable independently of cachet-her, a rotatable member bearing a record -receiving surface, two guides movable independently of each other along the, face of and transversely to the course of movement of therecord-receiving surface and each bearing position. indication, means connecting one of the guides with. one of said tuning shafts for movement with said shaft, and means connecting the other of the guides jwith the other of said two tuning shafts for movement with said shaft.

25. In a radio receiving mechanism, the combination of a movable member bearing a record surface of ample area to adapt it to receive numerous records of positions of two tuning members turnable independently of c each other, a fixed pointer guiding member near and in front of and transverse to the course of movement of the record surface, a first tuning member in operative relation with said record member for simultaneous movement of said record member and said tuning member, a second tuning member adapted to be brought into tune with the first tuning member and sending stations, and apointer adapted to traverse said pointer guiding member and being in operative relation with the second tuning member for simultaneous movement with said tuning member, whereby the same record sending station.

26. In a radio receiving mechanism, the combination of a movable member bearing a record surface of ample area to adapt it to receive numerous records of positions of two tuning members turnable independently of each other, a first tuning member in operative relation with said record member for simultaneous movement of said record member to said tuning member at reduced velocity, a second tuning member adapted to be brought into tunewith the first tuning 'member and sending stations, and a pointer adapted to traverse the surface of said 7 record member" transversely to the course of movement of said surface and being in operative relation with the second tuning member for simultaneous movement therewith and adapted to serve as a guide for making a record on said surfaceQwhereby by taking said pointer as a guide a single record may be placed on said surface to indicate the positions of the two tuning members when'in tune with a sending station and whereby the same record surface may by the aid of said pointer receive numerous records each of which indicates positions of the tuning members when in tune with each other and with a sending station.

27. In a radio receivingmechanism, the combination of a movable member bearing a record surface of ample area to adapt it to receive numerous records of positions of two tuning members turnable independently of each other, a first tuning member in operative relation with said record member for simultaneous movement of said record member to said tuning member at reduced velocity, the member having a long movement relative to the range of movement of 1,ese,eoe

the below-mentioned pointer, a second tuning member adapted to be brought into tune with the first tuning member and sending stations, and a pointer adapted to traverse the surface of said record member and being in operative relation with the second tuning member for simultaneous movement thercwith and adapted to serve as a guide for making a record on said surface, whereby by taking said pointer as a guide a single record may be placed on said surface to indicate the positions of the two tuning members.

28. In a radio receiving apparatus, the combination of a movable member bearing a record-receiving surface, a pointer located near and in front of said record-receiving surface and movable in a path transverse to and approximately parallel to said surface, two tuning members adapted to be brought into tune with each other and with the apparatus of a sending station, means placing one of said tuning members into operative relation for transmitting motion to said tuning member from said record member at reduced velocity, and means placing the other tuning member into operative relation with said pointer for moving said pointer in said transverse path, whereby marking may be made on said surface at said pointer when said tuning members have been brought into tune, said. marking being subsequently available for directing the moving of said surface and said pointer to attain the positions occupied by them when the marking was made, such return movement involving restoring the former positions and inter-relation of the tuning members.

In testimony whereof I have signed my name, this tth day of August, in the year one thousand nine hundred and twenty-five.

ALFRED F. SANFORD. 

